Royal Canadian Mounted Police Sergeant Renfrew and Constable Kelly ride out to an otherwise quiet trading outpost to investigate the murder of trapper Jim Smithers. At the scene of the crime, the Mounties find the body of Jim's brother Bill, along with a suicide note confessing to the killing. Using state-of-the-art forensics, they determine that both men were killed with the same weapon - a long-barrel rifle, highly unlikely to be used in a suicide. Now, Renfrew and Kelly must catch the criminals behind the slayings.